#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define LEN 40

int main(int argc ,char *argv[])
{
    FILE *in,*out;
    int ch;
    char name[LEN];
    int count = 0;

    if (argc<2)
    {
        fprintf(stderr,"Usage: %s filename\n",argv[0]);
        exit(EXIT_FAILURE);
    }
    if((in=fopen(argv[1],"r"))==NULL)
    {
        fprintf(stderr,"I couldn't open the file \"%s\"\n",argv[1]);
    }
    strncpy(name,argv[1],LEN-5);
    name[LEN-5]='\0';
    strcat(name,".red");
    if((out=fopen(name,"w"))==NULL)
    {
        fprintf(stderr,"Can't creat output file .\n");
        exit(3);
    }
    while ((ch=getc(in))!=EOF)
    {
       //if(count++ %3 == 0)
        putc(ch,out);
        printf("%c",ch);
    }
    if(fclose(in)!=0 || fclose(out)!=0)
        fprintf(stderr,"Error in closing files \n");
    
    return 0;
    

}